Refactor ServerSyncProvider usage in LiveCardProvider and add unregister method

refilc/lib/api/providers/live_card_provider.dart

@@ -46,7 +46,7 @@ class LiveCardProvider extends ChangeNotifier {
   late Timer _timer;
   late final TimetableProvider _timetable;
   late final SettingsProvider _settings;
-  final ServerSyncProvider _serverSync = ServerSyncProvider();
+  static final ServerSyncProvider serverSync = ServerSyncProvider();
 
   late Duration _delay;
 
@@ -64,7 +64,7 @@ class LiveCardProvider extends ChangeNotifier {
 
     // Token rotation figyelése: ha iOS új APNs tokent ad ki, szinkronizáljuk a szerverrel
     PlatformChannel.onTokenUpdated = (pushToken, deviceId, bundleId) {
-      _serverSync.refreshToken(
+      serverSync.refreshToken(
         pushToken: pushToken,
         bundleId: bundleId,
         liveActivityColor: '#${settings.liveActivityColor.toHexString().substring(2)}',
@@ -383,6 +383,7 @@ class LiveCardProvider extends ChangeNotifier {
         nextLesson!.start.difference(now).inMinutes > 60) {
       debugPrint("Több, mint 1 óra van az első óráig. Befejezés...");
       PlatformChannel.endLiveActivity();
+      serverSync.unregister();
       hasActivityStarted = false;
     } else if (hasActivityStarted &&
         !hasDayEnd &&
@@ -390,6 +391,7 @@ class LiveCardProvider extends ChangeNotifier {
         now.isAfter(prevLesson!.end)) {
       debugPrint("Az utolsó óra véget ért. Befejezés...");
       PlatformChannel.endLiveActivity();
+      serverSync.unregister();
       hasDayEnd = true;
       hasActivityStarted = false;
     }
@@ -404,7 +406,7 @@ class LiveCardProvider extends ChangeNotifier {
       final deviceId = result['deviceId'] ?? '';
       final bundleId = result['bundleId'] ?? '';
       if (pushToken.isNotEmpty && deviceId.isNotEmpty) {
-        await _serverSync.registerAndSync(
+        await serverSync.registerAndSync(
           deviceId: deviceId,
           pushToken: pushToken,
           bundleId: bundleId,

refilc/lib/api/providers/liveactivity/server_sync_provider.dart

@@ -123,6 +123,27 @@ class ServerSyncProvider {
     }
   }
 
+  Future<void> unregister() async {
+    if (_deviceId == null) return;
+    try {
+      final client = HttpClient();
+      final uri = Uri.parse('$_baseUrl/unregister');
+      final request = await client.postUrl(uri);
+      request.headers.contentType = ContentType.json;
+      request.write(jsonEncode({'device_id': _deviceId}));
+      final response =
+          await request.close().timeout(const Duration(seconds: 10));
+      if (response.statusCode == 200) {
+        debugPrint('ServerSync: schedule törölve (unregister)');
+      } else {
+        debugPrint('ServerSync unregister hiba: ${response.statusCode}');
+      }
+      client.close();
+    } catch (e) {
+      debugPrint('ServerSync unregister kivétel: $e');
+    }
+  }
+
   List<Lesson> _filterLessons(List<Lesson> lessons) {
     return lessons
         .where((l) =>

refilc/lib/api/providers/sync.dart

@@ -153,6 +153,7 @@ Future<void> syncAll(BuildContext context) async {
 
     if (Platform.isIOS && LiveCardProvider.hasActivityStarted == true) {
       PlatformChannel.endLiveActivity();
+      LiveCardProvider.serverSync.unregister();
       LiveCardProvider.hasActivityStarted = false;
     }
 

refilc/lib/helpers/live_activity_helper.dart

@@ -10,6 +10,7 @@ class LiveActivityHelper {
       await PlatformChannel.updateLiveActivity(LiveCardProvider.LAData);
     } else {
       await PlatformChannel.endLiveActivity();
+      LiveCardProvider.serverSync.unregister();
     }
   }
 }